The e-mail he sent to me ______ that he knew nothing about the earthquake happened in Japan.

The ______ of living areas makes wild animals become fewer than before.

This program _______in 1980, and so far __________thousands of oversees  Chinese students to China to look for their roots 

Teenagers are supposed to ________ their seats to the old on bus.

______ of Ling ling’s parents like living in Chongqing.